DD211191A1 - ARRANGEMENT OF DISPLAY INDICATORS FOR MIRROR REFLECTION CAMERAS - Google Patents

Abstract

D. The invention relates to an arrangement of display indicators in the viewfinder system of SLRs and has the task einzuspiegeln well self-illuminating indicators well u. to display the reflection field without vignetting. The object of the invention is achieved in that the displaceable display indicator in conjunction with at least one optical component is arranged diagonally forwardly in the receiving direction or directly behind the cover cap from above and under the cover. the reflection beam path runs parallel to the image elevating surface of the pentaprism. In the case of insufficient illumination from the outside, an additional light can be directed via multiple reflection prisms into the reflection beam path.

Description

Dresden, September 30, 1982

Title of the invention .

Arrangement of display indicators for SLR cameras

Field of application of the invention

The invention relates to an arrangement of display indicator in the viewfinder system of SLR cameras,

Characteristic of the known technical solutions

The arrangement of display indicators in the form of scales, symbols, hands, brands, LED and LCD displays in the viewfinder system in SLR cameras usually takes place near the viewfinder image plane, between field lens and Pentadachkantprisma, optionally with the use of optical deflection, or through Attachment directly on the field lens, If such indicators are not self-illuminants such as LED displays, their visibility in the viewfinder layer is dependent on the lighting conditions that prevail at the indicator location · If there is a dark object detail at this point, then the indicator deficient or not recognizable,

2.0 La arrangements are also known in which with additional

optical aids, the reflection of such indicators from an equivalent to the viewfinder image plane is made. This results in more favorable lighting conditions, but is a disadvantage that a. so-called Lichtschachtbetrachtung can not be excluded, which leads to more or less strongly vignettiertem Einspiegelungsfeld at not exactly centric view into the viewfinder. This means that the indicator is only visible at clearly defined observation conditions.

Object of the invention .

By applying the invention, the representation of indicator displays in the viewfinder image plane is to be improved for SLR cameras.

Explanation of the essence of the invention

The invention is based on the object einzuliege non-self-illuminating indicators in space-saving arrangement of optical components well visible in the viewfinder beam path and represent the Einspiegelungsfeld without vignetting.

According to the invention, the object is achieved in that the display indicator is arranged in connection with at least one optical component directly in the receiving direction or directly behind the top cap obliquely forward and the Einspiegelungsstrahlengang runs approximately parallel to the bildaufrichtenden surface of Pentadachkäntprismas. This is followed by a real mapping

the display in the viewfinder screen. It is advantageous if the optical component represents a mirror prism, which is the display indicator upstream or downstream and allows a deflection of the Einspiegelungsstrahlengangs parallel to Bildbildrichtenden surface of the Pentadachkantprismas. In order to achieve the object, it is also advantageous if a surface of the optical component arranged in front of the display indicator is diffusely scattering or if this component is assigned a scattering film or the cover disk is made diffusely scattering. Furthermore, the invention provides that the display indicators are preferably arranged at least in one direction, for the purpose of adjustment and / or for displaying multiple information at one point, displaceable. If the amount of light incident from the outside is not sufficient for the illumination, the arrangement of an optical component in front of the display indicator is provided such that additional illumination can be directed into the regular reflection beam path. Various forms of prisms can be used for this optical component, for example a cylinder prism, a triangular prism, a peasant enemy prism or other correspondingly designed prisms with multiple reflections. In order to create the most favorable lighting conditions for the reflection beam path, it is advantageous to arrange a compensating wedge component in front of the optical component for the additional lighting, which can be designed as a two-part pivoting or rotating wedge in order to be able to set optimum lighting conditions by changing the wedge angle.

embodiments

The invention will be described with reference to some embodiments

Pig. 1 b 3 Pig. 1 C 5 pig- 2, Pig. 4,

explained in more detail * In the accompanying drawings show: Pig. 1 a is a sectional view of the viewfinder system with indicator reflection, front view of the cover cap,

Sucherbildebene with mirrored indicator display, real pictures, variants of the indicator arrangement and variants of the indicator arrangement with additional lighting.

In Pig, 1 a, the indicator input is shown in conjunction with the viewfinder system. The display indicator 3 is illuminated by external light, which first encounters a mirror prism 2 from the front in the direction of pickup. Due to the further light guide in the interior of the top cap. 4

-]! 3 and the camera, preferably at a small distance and approximately parallel to the bildaufrichtenden surface of the Pentadachkantprismas 1, a space-saving arrangement is achieved simultaneously. There is a real image of the display indicator 3 in the seeker image plane (see Pig «.1 c), so that the Einspiegelungsfeld is displayed smoothly without vignetting.

From Pig. 2 it can be seen that the mirror prism 2 can also be arranged downstream of the display indicator. The arrows in the individual figures illustrate which components can each be moved in which direction for the adjustment and / or adjustment. LCDs are preferably used as indicators 3, which can also provide colored information by using color filters or foils *. However, conventional display means, such as symbol and scale plates, etc., are also on

Film material, Folio and other carriers can be used in negative and positive

The optical component arranged in front of the display indicator .3 may have a refractive effect, it may have a surface which is diffusely scattering or is associated with a scattering film. For example, the cover plate 5 (see FIG. 3) may be diffusely scattering.

If the amount of light incident from the outside is not sufficient for the illumination, then according to the invention an

Provided light source 7 from a below the top cap 4 arranged light source 7 * These light sources can be miniature lamps, light-emitting diodes or other lighting elements. As can be seen from Fig. 4, the light of the auxiliary illumination falls through the transparent part of the display indicator 3 on a cylinder prism 6 and is steered by this in the regular sine mirror beam path. In this case, a double reflection takes place on the cylindrical surface of the prism 6 and on the plane surface. Instead of a cylinder prism 6, a triangular prism 8 (see FIG. 5) or a correspondingly suitable other prism with multiple reflection may also be used. In order to adapt the reflection beam path from the outside to the most favorable illumination conditions, it is expedient to arrange a compensating wedge component in front of the optical component for the additional illumination. This can be designed as a two-part swivel or rotary wedge and create by changing the wedge angle respectively optimal lighting conditions.

Claims (8)

Erfindungsans pructT 1. Arrangement of display indicators in the viewfinder system of SLRs, characterized in that the display indicator (3) in conjunction with at least one optical ^l j component directly in the receiving direction or immediately behind the top cap (4) obliquely forward and the Einspiegelungsstrahlengang approximately parallel to Bildaufrichtenden surface of Pentadachkantprismas (1), wherein in the further beam path a real Äbbildung of the display in the seeker image plane. 2. Arrangement of display indicators according to item 1, characterized in that the optical component is a mirror prism - (2), which is the display indicator (3) upstream or downstream and a deflection of the Llnspiegelungsentrahlenganges parallel to the image erecting surface of the Pentadachkantprismas (1) " 3. Arrangement of display indicators according to item 2, characterized in that a surface dea diffused in front of the display indicator (3) arranged optical component. is scattering or assigned to this a scattering film or the cover plate (5) is designed diffusely scattering. 4. Arrangement of display indicators according to item 1, characterized in that a pivot or rotary wedge pair is arranged in front of the indicator or Einspiegelungsbauelement. 5 »arrangement of display indicators according to item 2, characterized in that are provided as display indicators (3) preferably at least in one direction displaceable LC displays. /. 6 Arrangement of display indicators according to item 1, characterized in that an optical component in front of the display indicator (3) is arranged so that an additional illumination in the regular Einspiege-: beam beam path is steerable. 7. Arrangement of display indicators according to item 6, characterized in that the optical component is a cylinder prism (6), a triangular prism (8) or another suitable prism. 8 · arrangement of display indicators according to item 6, characterized in that in the regular reflection beam path in front of the optical component for the additional lighting a Ausgleichskeil- component is present, which is designed as a two-part pivoting or rotating wedge. (For this 2 pages drawings)